Questions tagged [cement]

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29
votes
7answers
30k views

Pouring concrete, is it safe to add large rocks to increase volume?

Backround I'm going to pour some concrete to anchor a swing set. The base of the swing set that is being anchored is two 4x4s with a 2x4 footer crossed perpendicularly to the 4x4s. I have a bunch of ...
20
votes
5answers
6k views

Contractor is installing a vinyl fence and posts but is not using any water with concrete. Is he doing it right?

I hired a reputable local company to install 6 foot vinyl fence around my yard. Salesman was telling me how they would be using cement to hold the post in place. To my surprise I see the workers use ...
10
votes
3answers
7k views

What is this white powder on my foundation?

Can anyone tell me what this white powder might be? I was ripping up the carpet from my basement when I saw this underneath the padding and on the cement foundation. It's white and cakey. I at ...
7
votes
5answers
47k views

How much does cement weigh after it has set?

I'm looking to make some weight plates for a home gym and so I am planning on using cement to make the plates. But I know that some water will be absorbed and not evaporated when making the cement so ...
7
votes
1answer
2k views

What's the best way to level this basement floor?

Goal: Level basement slab in our 1905 Seattle home so I can install laminate flooring. Existing floor: 21' x 25' unreinforced rat slab thickness varies from ~2" at rim to as little as 3/4" near ...
6
votes
5answers
28k views

Is mortar waterproof?

I was advised by a professional that mortar is waterproof, however sources online are telling me that it's not. So is mortar waterproof or not? Does waterproofness vary by mortar classification (e.g. ...
6
votes
3answers
14k views

How to mix a resurfacer/leveler with sand and cement?

Disclaimer: No, I can't buy ready made surface leveler, because in Brazil this doesn't exist. I need to use a resurface a dry pack levelling that my previous contractor made a lousy job (porous ...
5
votes
4answers
21k views

Resetting fence posts in very wet conditions

This winter the Minnesota frost heaved up 5 fence posts in my yard. I've pulled out the 5 posts, and have found basically puddles of water and very very wet mud. I shop-vac'd out the standing ...
4
votes
1answer
1k views

Is it OK if my Durock cement board got wet?

I bought some cement board for the bathroom remodel and I stored it in the garage. No idea how but each sheet got a couple wet spots through them. I moved them inside to dry. After they dry are they ...
4
votes
2answers
7k views

In CLAY soil, looking for best method to set wood fence posts?

I am getting ready to install a wood fence. My problem is I have soil that is mostly clay. What is the best method to install posts in poor draining clay, giving me the best longevity?
4
votes
1answer
276 views

Why is the sand in my cement mixes so thirsty?

In making up cement-based mixtures, I always start with a water:cement ratio of 0.42:1, which is the optimal ratio. But whenever I make a mix that has a substantial quantity of sand in it (e.g. for ...
3
votes
3answers
416 views

How to replace loose 4x4 wood fence post with a steel post

The original 4x4 wood fence post for my home's side gate (that holds the catch part of a gate latch) is very loose and wobbles. The post is surrounded on 3 sides with my concrete walkway, and the 4th ...
3
votes
2answers
1k views

New grout yesterday, efflorescence today - what do I do?

I just finished grouting my kitchen floor with unsanded dark gray grout (near-black "charcoal" according to the box, also it contains portland cement). Not long after the first section I started ...
3
votes
2answers
3k views

Crumbling basement walls and asbestos

I want to refinish my basement walls, as they look really bad. I tore down some wood paneling that was starting to warp, and behind that was some styrofoam insulation. Behind styrofoam is 3 mil ...
3
votes
3answers
1k views

How do I prepare exterior concrete walls for painting?

My house exterior walls are cement - how do I prep it before painting? Here's some photos. I'm thinking maybe a pressure washer but would prefer an easier, less messy alternative if available. I read ...
2
votes
3answers
10k views

What Cement Based Product Is Used for Smoothly Finished Floors?

I recently replaced a floor drain in my basement around which I had dug out the concrete, gravel and clay soil. When I sealed it back in, I laid down a bed of gravel and sand, and then used a ...
2
votes
1answer
2k views

Disposal of hydrochloric acid

I used hydrochloric acid and water to remove concrete from my tools (in a plastic bucket) but did not know how dangerous it was and how complicated the disposal process can be--first time using it ...
2
votes
1answer
2k views

How to repair my concrete slab porch.

I bought this house a few years ago, built in 1926. Not long ago, what was a slight crack in the porch became much bigger when the concrete gave way. Now I have a serious safety situation and haven't ...
2
votes
3answers
49k views

How long and how often should I water my concrete?

I have just applied cement on some stone joints, and I was wondering for how long should I pour water on it? How frequently should I apply water? Is it twice a day, or thrice a day? I really need to ...
2
votes
1answer
61 views

Best practice for filling a pit in a concrete slab?

I have in my barn (concrete floor) a pit, of about 36" x 60" x 10" deep which was originally used to install some machinery by the previous owner. I have no use for it, and would rather ...
2
votes
1answer
72 views

Can an old-cement garage floor be painted in sections?

This question is related to our other question about relocation of our hot water heater. The current plan is to put the new water heater in the garage on the cement floor, so our concern is how to ...
2
votes
4answers
1k views

Mounting pull up bar on cinder block wall

So, I've read through a bunch of stuff online for mounting a pull up bar to a cinder block wall and before I go out and rent a hammer drill I want to see what would be the best anchor system for my ...
2
votes
2answers
406 views

Filling hollow blocks one level at a time

I live in an area where basic building materials are available but expensive - there are not many places to rent tools and things are done slowly by hand. It is also an earthquake zone. I am thinking ...
2
votes
2answers
1k views

Removing pole and concrete base from yard

I debated between putting this question here or on SE Gardening and Landscape, but I think this question will be a better fit for this site... Let me know if I need to move it. So I'm now leading ...
2
votes
1answer
3k views

How do I calculate how much sand, cement and water I need for a specific volume of concrete?

I am using forms to build a decorative wall. The instructions say I need 38 liters total per form. The form ends up producing a wall section 200 centimeters long x 50 centimeters high. How do I ...
2
votes
2answers
555 views

How strong are my two ten foot poles?

I have made a bat house and now I have put it up. To do so I purchased two teen foot galvanized steel poles at Home Depot, and attached them together. Where they meet I drilled a hole through the two ...
2
votes
1answer
350 views

Foundation Cinderblock Chipped Repair

I seem to have a fairly large chip in one of my foundation cinderblocks. Is this type of damage repairable as a DIY project?
2
votes
2answers
23 views

Securing brick, rock or pavers on artificial turf

I want to build a backyard putting green. The company I am going to buy the turf from (Garden-mark) says to lay the artificial grass over prepped ground as if laying pavers and secure the turf with ...
2
votes
3answers
1k views

Method for setting 6' wood fence posts in clay soil

Background Currently in the process if planning/designing a privacy fence after recently removing the old posts from the ground. I'm now at a point that you might call analysis paralysis involving ...
2
votes
2answers
1k views

I want to mix old latex paint with ready concrete mix or cat litter to make pavers. [closed]

I want to mix latex paint with ready mix concrete or cat litter to make pavers. Trying to find a way of using approx 200 gallons of old paint since I can't dispose it. Also trying to come up with ...
2
votes
2answers
243 views

replumb leaning post

6 ft tall 4x4 PT post out of plumb by 1-3/8". Excellent condition. Years old. Set in cement. Rock solid in part because tree roots have encased the cement. Tree too valuable to risk damaging roots by ...
2
votes
1answer
6k views

How can I fasten a threshold to concrete?

BACKGROUND A threshold was purchased from HomeDepot: The item comes with screws and needs to be fixed into concrete slab. I would like to understand how to properly screw the threshold into the ...
2
votes
2answers
220 views

How can I repair and waterproof a large crack in my foundation wall?

I recently just bought a house which was nice at first! Now after 5 month, it is now spring. We had a good rainfall which flooded my basement from the floor up because of a high water table (sump ...
2
votes
2answers
821 views

Pouring foundations in cold weather, builder didn't protect them - how to tell if it is set right?

Our builders have just poured the foundations for our house this past Friday, but did not cover them to protect them from the cold. We experienced temperatures ranging from -2 to -7 overnight during ...
2
votes
2answers
174 views

What is this cement coating?

I have this coating on my front porch which is starting to disintegrate. I think the porch slab is probably still good, so I want to just replace the coating but I can't figure out what it is. I'm ...
2
votes
1answer
633 views

Is 'bonding agent' the same as 'admixture adhesive'?

I see many tutorials regarding stucco and concrete talking about bonding agent that is applied like a primer, but there is no such thing in Brazil (I guess). What we do have is something describe as "...
2
votes
1answer
53 views

I’m needing advice on making garden spheres [closed]

I am trying to make garden spheres. First attempt was concrete..no success too much aggregate need a smooth mix. 2nd attempt was cement, much smoother but doesn’t come in quickset so Bunnings staff ...
1
vote
2answers
172 views

Lard as release agent?

So I’m learning how to make concrete pavers with this youtube video. He mentions that he uses lard as a release agent, so he brushes that into the mold. He also suggests cooking oil or motor oil for ...
1
vote
1answer
45 views

Proper deck post installation

I am having a deck installed and question how the posts are done. The deck is from 2 to 5 feet above ground on a slope. The holes were dug, probably 5 feet deep near the house then about 4 feet at ...
1
vote
1answer
107 views

Is this retaining wall failing? [closed]

The picture below shows a retaining wall. It was hard to take a picture from a good angle, but it looks to me like the wall is showing a "belly" and the seams are opening up. But I'm not sure: perhaps ...
1
vote
3answers
134 views

Can you “refresh” half-dried concrete just by mixing in water?

I mixed a wheelbarrow load of concrete (sand, cement, water) this morning, but before I could use most of it, I got called away and didn't get back until this evening, like 7-8 hours later. By now the ...
1
vote
1answer
76 views

Which cement or mortar will give best result when creating low water diversion barriers?

I want to build up a short dam of maybe half an inch in height, to control where water is flowing. The water flows as a small, steady trickle. Right now it fans across a large-ish area. I'd like to ...
1
vote
1answer
150 views

Recommended paint for outdoor cement patio

In my back garden, I have a small cement pad. It used to have a shed on it, but the previous owner took it with them when they left. I've decided to turn it into a sort of patio, which is working well....
1
vote
1answer
432 views

bathroom pipe joint leakage behind the ceiling tiles

There is a water leakage in the pipe joint behind the ceiling titles in my bathroom, as shown below(I glued some putty around the joint but it didn't work, the joint looks like the one on the left), ...
1
vote
2answers
1k views

outside cement wall chipped

I have a cement wall that has been chipped a little: What can happen to this wall over time? Will this deteriorate if left as is? In short: do you think it's important to fix this ASAP or this can ...
1
vote
2answers
11k views

Quikrete didn't absorb much water. What did I do wrong?

I am installing a hammock support post to support one end of a hammock. Following the manufacturers instructions, I dug a hole 18" in diameter to about 25" deep. Our soil is red clay, if that matters, ...
1
vote
2answers
64 views

How long for this cement smell to go?

Somebody recently came and filled this deep hole up with cement. It has been giving off a strong odor. Does cement typically smell and how long will it take for the smell to go mostly and eventually ...
1
vote
2answers
93 views

Do I really need 140 lbs of cement for a 5“, 5' high vinyl fence post (31” in the ground)?

140 lbs Seems like a lot of cement, I was hoping to get by with just one 80# bag. I guess the hole would be 12" per auger rental advice. I Live in Montana, not a lot of moisture but ground freeze ...
1
vote
3answers
112 views

Cracks on second-story cement slab

I just purchased a 50-year-old condo. I pulled up the carpet and found the second floor to be a concrete slab. There are thin cracks in areas and a small pit in one area. What are my options for ...
1
vote
4answers
132 views

Can I create concrete driveway with forms to get the paver stone look without the need for all the aggregate beneath?

We are in desperate need of repaving our backyard that serves as a parking lot in addition to redoing our driveway. After weighing the pros and cons and taking in aesthetics we are interested in doing ...